Question: Use the exponential decay model, A = A 0 e kt , to solve this exercise. The half-life of polonium-210 is 140 days. How long

Use the exponential decay model, A = A₀e^kt, to solve this exercise. The half-life of polonium-210 is 140 days. How long will it take for a sample of this substance to decay to 20% of its original amount?

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